EP0935059B1 - Device for operating a supercharged internal combustion engine - Google Patents

Description

The invention relates to a device for a supercharged internal combustion engine with a Exhaust gas turbine, a compressor and an intercooler and an arrangement for condensate separation, the condensed water from the housing of the intercooler automatically promoted via a line connection and is evaporated in the exhaust gas stream.

Internal combustion engines of greater power, especially for Diesel engines as marine propulsion and stationary Systems that charge air pressure> 4 bar (abs.) can not always achieve with charge air temperatures be operated above the dew point of the charge air. In tropical conditions falls in the intercooler Condensation, which can lead to corrosion in the motor can. The dew point temperatures move at these Charge pressures well over 60 degrees C. So everyone Condensation should be avoided here Charge air temperatures between 65 and 70 degrees C. become. The problem here is that the motors considering full load in tropical operation of these charge air temperatures is thermally overloaded become.

It is known that the condensate from the Derive charge air duct by opening openings constantly an air / water mixture is blown off. if only Water leaks, the drainage nozzles are flooded and the water detection probe triggers an alarm. In order to drive without an alarm, it is necessary to Combination to raise the charge air temperature moderately and / or reduce performance.

A constant blow off of the charge air into one Engine room can also be arranged by so-called condensates can be avoided. measurements but have shown that only a small part (approx. 20%) of the condensed water generated via the Openings in the charge air duct are discharged. The small droplet size of the condensate (formation of fog) and maintain the flow rate of the charge air large amounts of the condensed water in suspension, so that get it into the combustion chambers with the combustion air can.

With an arrangement of a water separator directly on Air leakage from the charge cooler will be large amounts of Condensed water collected and drained. The The degree of separation should be at least 80%. The The amount of condensed water can be in tropical operation (Intake air parameters: temperature 45 degrees / relative Humidity 50 degrees) up to 50 ml / Kw h. This occurring large amounts of condensed water no longer simply in the case of ship propulsion systems Bilge can be derived because of the bilge emptying prescribed bilge water deoiler only for much smaller quantities are designed. The other Possibility of condensate in one Collect collection containers and outboard pumping out is relatively complex and expensive.

According to DE-A-2646490 there is already a charged one Internal combustion engine became known, the intercooler with a spray device to clean his with a surface covered by the charge air Rinsing liquid is provided. Here is the charge air cooler a liquid separator for the rinsing liquid downstream, which provided with a drain line is. This drain line has a throttle Limitation of the air flow in this line.

Furthermore, DE-A-2814593 an arrangement is known become a condensate drain automatically carries out and the condensate discharged in Flow direction in front of the exhaust gas turbine in the Introduces exhaust pipe of the internal combustion engine and one Cleaning effect on the turbine by the water vapor is adjustable. In this arrangement there is only one low pressure drop available for Operating conditions at high relative Air humidity not sufficient condensate drainage guaranteed.

The object of the invention is a method and a device for condensation removal a supercharged internal combustion engine in large quantities to create, the resulting condensation in is easy to dispose of and without expensive Construction work on the engine allows disposal.

This object is achieved by the features of the characterizing part of claim 1 solved.

Further advantageous training courses are through the Characteristics of the subclaims marked.

The main advantages achieved with the invention consist of the fact that the introduction of the accumulating condensate in the exhaust pipe, especially in the direction of flow after the exhaust gas turbine a residue-free disposal of the condensate without additional energy supply is guaranteed.

The connection of the pipes to the housing of the Intercooler and on the exhaust pipe piped inside the engine. As a result, the construction effort is very high low.

It is also advantageous that by introducing the Condensed water in the flow direction after the turbine, the condensed water due to the pressure difference between Charge air and exhaust gas, without aids in the exhaust gas flow can be promoted and evaporated in this.

So that the charge air blow-off volume is negligibly small remains, there is an orifice arrangement in the pipes intended.

When the condensed water is fed into the Exhaust gas flow is effective at every load level Evaporation because only at higher charge pressures Condensation occurs and then the exhaust gas mass flow and the exhaust gas temperature is accordingly high are, which is an ideal self-regulating effect results. Evaporation of the condensed water will also extremely favored by the fact that none full water jet can get into the exhaust pipe, but only an air-water mixture due to the boost pressure is sprayed.

By feeding the condensed water into the Exhaust pipe is a charge air temperature control that enables a dew point to be exceeded, superfluous and can be omitted provided that the low charge air temperature at partial load (approx. 25 degrees up to 40 degrees) are not harmful to the engine.

Fig. 1

eine Seitenansicht eines Teils einer Brennkraftmaschine mit Rohrleitungen für Kondenswasser und

Fig. 2

eine Seitenansicht gemäß Fig. 2 in um 90 Grad gedrehter Lage.

An embodiment of the invention is shown schematically in the drawing. Show it:

Fig. 1

a side view of part of an internal combustion engine with pipes for condensation and

Fig. 2

a side view of FIG. 2 in a position rotated by 90 degrees.

The internal combustion engine 1 shown has one Exhaust gas turbocharger with one exhaust gas turbine and one Compressor and an intercooler 2.

On a housing of the charge air cooler 2 are on the bottom Processes 3.4 arranged with piping 5.6 are connected. These are an exhaust gas transition piece 7 led an exhaust pipe and open out via inlets 3a, 4a in this exhaust gas transition piece 7. The inlets 3a, 4a are separated from each other, so that the introduction of the condensed water in the transition piece 7 over two Areas.

The pipes 5,6 are around the housing of the Charge air cooler 2 led around and the Exhaust pipe with its transition piece 7 via a fed oblique section. The Pipelines 5,6 preferably occur adjacent to Turbine 8 in the transition piece 7 of the exhaust pipe. This enables optimal evaporation of the supplied condensed water.

The charge air blow-off quantity can not be specified by a Shutter arrangement shown on the pipes 5,6 be minimized so that they are negligibly small is.

When the internal combustion engine 1 is operating, it collects 2 condensed water in the charge air cooler housing. This is in the piping 5.6 in the direction of the arrow in the Transition piece 7 of the exhaust pipe promoted. This takes place due to the pressure difference between the Charge air cooler 2 and the exhaust pipe automatically. in the Transition piece 7 then evaporates Condensate in the exhaust gas flow.

Claims (5)

1. Apparatus for a supercharged internal combustion engine (1) comprising an exhaust gas turbine, a compressor and an intercooler (2) as well as an arrangement for separating condensation water, wherein the condensation water is automatically fed from the housing of the intercooler through a line connection and evaporated in the exhaust gas flow, characterized in that the arrangement for separating condensation water is connected by a condensation-water-carrying line connection (5, 6) to the exhaust passage (7) of the internal combustion engine (1) downstream of the exhaust gas turbine (8) to the exhaust passage (7) of the internal combustion engine (1).
2. Apparatus according to claim 1, characterized in that outlets (3, 4) with connected pipes (5, 6) are disposed in the bottom of the housing of the intercooler (2) on at least two sides and said pipes (5, 6) open into inlets (3a, 4a) into a transition piece (7) of the exhaust passage.
3. Apparatus according to claim 1 or 2, characterized in that the inlets (3a, 4a) of the pipes (5, 6) open separately into the transition piece (7) of the exhaust passage.
4. Apparatus according to one of claims 1 to 3, characterized in that the pipes (5, 6) have orifice arrangements for dimensioning of the charged-air blowoff quantity.
5. Apparatus according to one of claims 1 to 4, characterized in that the pipes (5, 6) open adjacent to the exhaust gas turbine (8) into the transition piece (7) of the exhaust passage.

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